Answer:
The best estimate of the population mean for heart rate among football players is of 71.4 beats per minute.
Step-by-step explanation:
The best estimate for the population mean is the sample mean.
Sample mean:
Sum of all values in the sample divided by 10(size of the sample). So

The best estimate of the population mean for heart rate among football players is of 71.4 beats per minute.
Answer:
d. Since fertilizer is in both data sets and is positively correlated to both tree height and fruit yield, it is like that tree height and fruit yield are also positively correlated.
Step-by-step explanation:
The correlation refers to the relationship between two or more variables i.e how they are interrelated to each other. It can be positive, negative, perfect, etc
As we can see in the figure that in both the data sets the fertilizer contains the same values which depict that they are positively correlated with respect to the height of tree and fruit yield that derives that the height of tree and fruit yield is also positively correleated
Here positive correlation means that the two variables moving in a similar direction i.e if one variable increased so the other is also increased
Therefore the option d is correct
Answer:
Step-by-step explanation:
There are 50 students in a group.
Using Venn diagram, we have 50=x+8+7+5+x+9+(x+3)50=x+8+7+5+x+9+(x+3) .
50=3x+3250=3x+32
3x=183x=18
x=6x=6
The number of students that take Maths is x+8+7+5=26x+8+7+5=26 .
Answer: x=6x=6 ; 2626 students take Maths.